1. Birkhoff, G., von Neumann, J.: The logic of quantum mechanics. Ann. Math. 37, 823–843 (1936)
2. Burris, S., Sankappanavar, H.P.: A course in universal algebra, The Millennium Edition (2000)
3. Chang, C.C.: Algebraic analysis of many-valued logics. Trans. Amer. Math. Soc. 88, 467–490 (1958)
4. Darnel, M.R.: Theory of lattice-ordered groups. New York (1995)
5. Di Nola, A., Georgescu, G., Iorgulescu, A.: Pseudo-BL algebras I, Multiple Val. Logic 8, 673–714 (2002)